Chapter 6 Troubleshooting
173
Table 6-3 Motor fault and corrective measure
Fault
Check Content
Corrective Measures
The motor
fails to run
Check whether the power is supplied to the
power terminals R, S and T and whether
the CHARGE LED indicator light is on.
Be connected to the power supply
Disconnect the power supply and then be
connected to it again.
Check the power voltage
Check whether the terminal screws have
been tightened
The motor
fails to run
Test whether the voltage of terminals U,
V and W is correct with the rectifier
voltmeter
Disconnect the power supply and then be
connected to it again.
Check whether the motor has been locked
due to overload
Reduce the load and remove the lockout
Check whether there is fault display on the
keypad and whether the TRIP light is
flickering
Search Table 6-1 according to the fault
codes
Check whether there is the operation
command
Check whether the operating terminal
connection lines and the connection lines
between 24V & PLC are connected
reliably
Check whether the anti-reverse selection
setting conflicts with the direction
command
Set the reverse allowing or direction
changing command
Check whether the terminal operation
signal is disconnected first and then
connected after the fault occurs
The terminal operation signal is
disconnected first and then connected
Check whether the given frequency voltage
is input
Check the given frequency voltage
Check whether the operation manner is set
correctly
Input the correct setting
The motor
rotates
reversely
Check whether the connection lines of
terminals U, V and W are correct
Adjust the corresponding connection lines
of terminals U, V and W
Adjust the function code P2.45
The motor
rotates but
cannot
change the
speed
Check whether the connection lines of
given frequency circuit are correct
Correct the connection lines
Check whether the load is too large
Reduce the load or increase the
acceleration or deceleration time
The motor
rotating
speed is too
high or too
low
Check whether the maximum output
frequency setting value is correct
Check the maximum output frequency
setting value
Check whether the voltage drop between
the motor terminals is too large with the
rectifier voltmeter
Check the V/F characteristic value
The motor
rotating
speed is
unstable
during
operation
Check whether the load is too large
Reduce the load
Check whether the load variation is too
large
Reduce the load variation
Check whether there is phase loss with the
three-phase power
Check whether there is phase loss with the
connection lines of the three-phase power
For the single-phase power, connect the
AC reactor to the power supply
The frequency giving source is unstable
Check the frequency giving source
There is too
much noise
with the
motor
The bearing is worn, lubrication is poor ,
and the rotor is eccentric
Repair the motor
The carrier frequency is too low
Increase the carrier frequency
